The Collaborative International Dictionary of English v.0.48:
Campestral \Cam*pes"tral\, Campestrian \Cam*pes"tri*an\, a. [L. campester, fr. campus field.] Relating to an open field; growing in a field, or open ground. [1913 Webster]WordNet (r) 3.0 (2006):
campestral adj 1: of fields or open country; "living in campestral seclusion"